The Final Idea:

So I got the magnetic tape head out of the children's tape player and got them to still work when the play button is pressed. YA!!! When I pull magnetic tape over the head it makes a mixing sound similar to a DJ scratching a record. I also created a devise that moves from left to right hopefully it will work in unison with the walls. The idea is that when the devise moves the magnetic head will also move and therefore move across the magnetic tape making the scratching noise.